Question

Some horses develop nose bleed during races perhaps because of

• A. The high cholesterol in their blood
• B. The high blood pressure involved
• C. Their need to bring down their body temperature
• D. All of the above

Answer 1

The correct option is B The high blood pressure involved

Exercise-Induced Pulmonary Haemorrhage (EIPH), commonly known as bleeding, is the most widely recognized of all disorders affecting racehorses. EIPH is characterized by bleeding from the lungs after strenuous exercise. Research studies have shown that horses experience unusually high blood pressures within the lungs during exercise. Deep within the lung, thousands of tiny air sac or alveoli interface with capillaries, forming the blood-gas barrier. This incredibly thin barrier readily allows oxygen to move from the lungs into the blood (and carbon dioxide to move in the opposite direction). This blood-gas barrier is not sufficiently strong in horses, to withstand high stress on the capillary wall, that exist during races or intense exercise. Due to which some lung capillaries get ruptured and release blood into the airways. The term "pulmonary capillary stress failure" is also used to describe this phenomenon.

So, the correct answer is option B.